com.izforge.izpack.installer.requirement.InstallerRequirementChecker Maven / Gradle / Ivy
/*
* IzPack - Copyright 2001-2012 Julien Ponge, All Rights Reserved.
*
* http://izpack.org/
* http://izpack.codehaus.org/
*
* Copyright 2012 Tim Anderson
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.izforge.izpack.installer.requirement;
import java.util.logging.Logger;
import com.izforge.izpack.api.data.InstallData;
import com.izforge.izpack.api.data.InstallerRequirement;
import com.izforge.izpack.api.handler.Prompt;
import com.izforge.izpack.api.installer.RequirementChecker;
import com.izforge.izpack.api.resource.Messages;
import com.izforge.izpack.api.rules.Condition;
import com.izforge.izpack.api.rules.RulesEngine;
/**
* Evaluates each {@link InstallerRequirement} returned by {@link InstallData#getInstallerRequirements()}
* to determine if installation should proceed.
*
* @author Tim Anderson
*/
public class InstallerRequirementChecker implements RequirementChecker
{
/**
* The installation data.
*/
private final InstallData installData;
/**
* The rules engine.
*/
private final RulesEngine rules;
/**
* The prompt.
*/
private final Prompt prompt;
/**
* The logger.
*/
private static final Logger logger = Logger.getLogger(InstallerRequirementChecker.class.getName());
/**
* Constructs a InstallerRequirementChecker.
*
* @param installData the installation data.
* @param rules the rules engine
* @param prompt the prompt
*/
public InstallerRequirementChecker(InstallData installData, RulesEngine rules, Prompt prompt)
{
this.installData = installData;
this.rules = rules;
this.prompt = prompt;
}
/**
* Determines if installation requirements are met.
*
* @return true if requirements are met, otherwise false
*/
@Override
public boolean check()
{
boolean fail = false;
Messages messages = installData.getMessages();
for (InstallerRequirement requirement : installData.getInstallerRequirements())
{
String id = requirement.getCondition();
Condition condition = rules.getCondition(id);
if (condition == null)
{
fail = true;
logger.warning(id + " is not a valid condition.");
break;
}
if (!condition.isTrue())
{
fail = true;
String message = requirement.getMessage();
if (message != null)
{
String localizedMessage = messages.get(message);
prompt.message(Prompt.Type.ERROR, localizedMessage);
}
break;
}
}
return !fail;
}
}